      DOUBLE PRECISION FUNCTION X02AKF()
C     MARK 12 RELEASE. NAG COPYRIGHT 1986.
C
C     RETURNS  B**(EMIN-1)  (THE SMALLEST POSITIVE MODEL NUMBER)
C
C     .. Executable Statements ..
      X02AKF = 0.25 * 2.0D0**(-126)
      RETURN
      END
